Titanium base alloys



United States Patent TII'ANIUM BASE ALLOYS Harold Margolin, Mount Vernon, and William Frank Kirk, Bronx, N. Y., assignors to Kennecott Copper glforfioration, New York, N. Y., a corporation of New N0 Drawing. Application October 16, 1956 Serial No. 616,120

7 Claims. (Cl. 75175.5)

"ice

2 good ductility and other desirable properties including good machinability, high modulus of elasticity, good cold workability and good elevated temperature properties.

The improved titanium base allows of the invention accordingly comprise titanium as the major constituent, and from 0.1% to 4% of lead, from 3% to 7% of aluminum, from 0.5 to 2.8% of vanadium, from 0.5% to 2.5% of tin, and up to 4%, preferably from 0.5% to 3.5% of zirconium, when this metal is used. Oxygen and nitrogen are considered to be objectionable impurities in these alloys and, it present should, in the aggregate, be in an amount less than about 0.2%. It is to be understood that the alloys may include the usual impurities contained in the ordinary commercial metals used in forming the alloys, and small amounts of one or more other metals which do not alter in any practical sense the characteristics of the alloys.

Typical titanium base alloys of this invention are illustrated in the following Table I which shows their compositions and mechanical properties. The titanium is the unrecorded balance.

Table I Analyzed Composition Specific Tensile 0.2% Percent Percent Modulus of VHN Treat- Alloy N0. Gravity Strength 01?. Y. S. Elong Redin Elasticity (10kg.) ment" Percent Percent Percent Percent Percent (p. s. 1.) (p. s. 1.) (1") Area (p s. l. 10-) Pb Al V 811 Zr 1 1.38 3.20 2.13 2.23 4.50 140,300 130,000 11.5 30.0 17.1 327 F 2 0.74 5.30 1.17 1.10 4.51 140,000 135,400 13.5 33.0 10.1 327 A ii go 130333 i5? 3;; i3? 320 3 3 1401300 1341200 1215 4017 1312 330 A 142,000 140, 000 10. 3 40. 2 13. 9 327 D 3123 33:; 3; 3

1 1, 12.1 25.1 1. 4 L35 L02 1521000 150,000 14.0 30.3 13.0 343 A 153, 300 140, 500 13. 3 33. s 13. 0 303 B 5 1.22 5.40 2.13 2.23 4.52 120, 12.2 21.2 I I .0 1 7 1541000 143,000 11.5 20.0 10.7 300 A 155,000 144,000 13. s 37. 7 17. 7 300 B 1333 333 32 3: 12 3 1 1 8 L96 M3 151,000 145,000 10.0 30.0 17.1 345 B 154,000 144,000 15. 3 30. 1 1s. 2 303 A 140, 500 137, 500 10. 7 30. s 10. 5 310 D 142,500 127, 200 10. 5 24. 5 10.3 327 n 0 0.73 0.30 1.04 1.17 4.43 145,200 140,000 15.2 33.0 13.4 320 o 140, 000 130, 300 13. 0 40. 3 20. 5 357 B 151, 300 145, 000 12. 3 33. 3 18.8 330 A 140,200 135,000 11.2 32. 3 13. 7 322 I 1332 303 32 3s 3 14, 41. 1. 27 M6 2507 147,200 120,000 10.3 30.7 10.7 327 F 155,200 152,500 0. 3 31. 4 1s. 3 351 B 155,200 140, 000 0. 0 27. 5 13. 3 300 A 1332 3123 31 31 3 23 3 .3 11 150,000 144,000 7.3 13.0 17.3 307 B A 133s 3133 02 5 3.0 3 12 M6 L09 {101,500 100,200 0.7 10.0 17.5 354 o *A-As forged and heated for 24 hrs. at 500 0. and water quenched. *B-As forged and heated for 24 hrs. at 400 C. and water quenched.

*C-As forged and heated for 2 hrs. at 775 C. and water quenched and heated for 24 hrs. at 500 C. and again water quenched.

*D-As forged. *E-As forged and heated for 04 hr. at 1050 C. and water quenched. "F-As forged and heated for 1 hr. at 900 C. and water quenched.

G-As forged and heated for 1 hr. at 900 0. and water quenched and heated for 24 hrs. at 500 C. and again water quenched.

*H-As forged and heated for 2 hrs. at 775 C. and air cooled. *I-As forged and heated ior 2 hrs. at 775 C. and water quenched.

amounts up to about 4%. The alloys of the invention The alloys of this invention have very good elevated are characterized by very good tensile strength, high temperature properties which are shown in Table II ratio of yield strength to tensile strength combined with for the temperature of 1020 F.

Table II [Elevated temperature properties at 550 C. All speclmens'prevailing heat-treated 500 0. fol-2411mm] Analyzed Composition Percent Alloy Speclfic Tensile 0.2% 011. Elonga- Percent N0. Gravity Strength Yield Str. tlon Red. in

Percent Percent Percent Percent (p. s. 1.) (p. s. i.) (1") Area Pb A1 Sn 0. 90 3. 05 2. 03 2. l5 4. 56 68,900 64, 200 14. 4 65. 5 l. 38 3. 29 2. 13 2. 28 4. 59 83, 600 78, 400 13. 4 65. 1 0. 74 5. 30 l. 17 1. 10 4. 51 91, 200 83, 600 11. 4 46. 0 0. 87 5. 27 2. 11 2. 09 4. 54 07, 100 92, 100 8. 1 33. 6 0. 78 6. 37 1. 04 1. 17 4. 48 97, 300 84, 400 11. 9 39. 8 0. 96 6. 78 2. 18 2. O7 4. 52 105, 800 7. 0 30. 5

We claim:

1. Titanium base alloys consisting essentially of from 0.1% to 4% of lead, from 3% to 7% of aluminum, from 0.5% to 2.8% of vanadium, from 0.5% to 2.5% of tin and the balance of alloying metal being titanium, said alloys having tensile strengths in excess of 136,000 p. s. i. coupled with good ductility, as represented by a reduction in area of at least 8.7%.

2. Titanium base alloys consisting essentially of from 0.1% to 2.5% of lead, from 3% to 7% of aluminum, from 0.5% to 2.8% of vanadium, from 0.5% to 2.5% of tin.

3. Titanium base alloys consisting essentially of from 0.1% to 1.5% of lead, from 3% to 7% of aluminum,

from 0.5% to 2.8% of vanadium, from 0.5% to 2.5 of 30 tin.

4. A titanium base alloy according to claim 1 con sisting essentially of from 0.5% to 3.5% of zirconium.

5. A titanium base alloy according to claim 2 consisting essentially of from 0.5% to 3.5% of zirconium.

6. A titanium base alloy according to claim 3 consisting essentially of from 0.5%- to 3.5% of zirconium. 7. A titanium base alloy according to claim 1 which consists ofup to 4% zirconium.

References Cited in the file of this patent UNTTED STATES PATENTS 

1. TRITANIUM BASE ALLOYS CONSISTING ESSENTIALLY OF FROM 0.1% TO 4 OF LEAD, FROM 3% TO 7% OF ALUMINUM, FROM 0.5*% TO 2.8% OF VANADIUM, DROM 0.5% TO 2.5% OF TIN AND BALANCE OF ALLOYING METAL BEING TITANIUM, SAIDALLOYS HAVING TENSITE STRENGTHS IN EXCESS OF 136.000 P.S.T. COUPLED WITH GOOD DUCTILITY, AS REPRESENTED BY A REDUCTION IN AREA OF AT LEAST 8.7%. 